Modeling Transport Properties And Electrochemical Performance Of Hierarchically Structured Lithium Ion Battery Cathodes Using Resistor Networks And Mathematical Half Cell Models
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Modeling Transport Properties And Electrochemical Performance Of Hierarchically Structured Lithium Ion Battery Cathodes Using Resistor Networks And Mathematical Half Cell Models
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Author : Birkholz, Oleg
language : en
Publisher: KIT Scientific Publishing
Release Date : 2022-10-05
Modeling Transport Properties And Electrochemical Performance Of Hierarchically Structured Lithium Ion Battery Cathodes Using Resistor Networks And Mathematical Half Cell Models written by Birkholz, Oleg and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-05 with Science categories.
Hierarchically structured active materials in electrodes of lithium-ion cells are promising candidates for increasing gravimetric energy density and improving rate capability of the system. To investigate the influence of cathode structures on the performance of the whole cell, efficient tools for calculating effective transport properties of granular systems are developed and their influence on the electrochemical performance is investigated in specially adapted cell models.
Dynamic Model Based Analysis Of Oxygen Reduction Reaction In Gas Diffusion Electrodes
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Author : Röhe, Maximilian
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-01-09
Dynamic Model Based Analysis Of Oxygen Reduction Reaction In Gas Diffusion Electrodes written by Röhe, Maximilian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-09 with categories.
In this work, the first simulation model of oxygen depolarized cathodes (ODC), which are silver catalyst-based gas diffusion electrodes, is presented that considers the phase equilibrium of the gas-liquid interface and structure-related inhomogeneities in electrolyte distribution. By means of the model it has been identified that mass transport of water and ions in the liquid phase is a crucial factor for electrode performance and how it is influenced by the electrode structure.
Multiscale Modeling Of Curing And Crack Propagation In Fiber Reinforced Thermosets
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Author : Schöller, Lukas
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-03-15
Multiscale Modeling Of Curing And Crack Propagation In Fiber Reinforced Thermosets written by Schöller, Lukas and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-03-15 with categories.
During the production of fiber-reinforced thermosets, the resin material undergoes a reaction that can lead to damage. A two-stage polymerization reaction is modeled using molecular dynamics and evaluations of the system including a fiber surface are performed. In addition, a phase-field model for crack propagation in heterogeneous systems is derived. This model is able to predict crack growth where established models fail. Finally, the model is used to predict crack formation during curing.
Understanding Degradation Phenomena In Solid Oxide Fuel Cell Anodes By Phase Field Modeling And Analytics
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Author : Hoffrogge, Paul Wilhelm
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-10-09
Understanding Degradation Phenomena In Solid Oxide Fuel Cell Anodes By Phase Field Modeling And Analytics written by Hoffrogge, Paul Wilhelm and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-10-09 with categories.
The current work analyzes degradation effects in solid-oxide fuel cell anodes with the phase-field method. A model extension for interface diffusion is formulated and calibrated. Large-scale 3D-simulations provide interesting insights into phenomena at the microscale which are responsible for the degradation
Application Of Data Mining And Machine Learning Methods To Industrial Heat Treatment Processes For Hardness Prediction
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Author : Lingelbach, Yannick
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-07-24
Application Of Data Mining And Machine Learning Methods To Industrial Heat Treatment Processes For Hardness Prediction written by Lingelbach, Yannick and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-07-24 with categories.
This work presents a data mining framework applied to industrial heattreatment (bainitization and case hardening) aiming to optimize processes and reduce costs. The framework analyses factors such as material, production line, and quality assessment for preprocessing, feature extraction, and drift corrections. Machine learning is employed to devise robust prediction strategies for hardness. Its implementation in an industry pilot demonstrates the economic benefits of the framework. - This work presents a data mining framework applied to industrial heattreatment (bainitization and case hardening) aiming to optimize processes and reduce costs. The framework analyses factors such as material, production line, and quality assessment for preprocessing, feature extraction, and drift corrections. Machine learning is employed to devise robust prediction strategies for hardness. Its implementation in an industry pilot demonstrates the economic benefits of the framework.
Development Of Nbn Based Kinetic Inductance Detectors On Sapphire And Diamond Substrates For Fusion Plasma Polarimetric Diagnostics
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Author : Mazzocchi, Francesco
language : en
Publisher: KIT Scientific Publishing
Release Date : 2022-07-01
Development Of Nbn Based Kinetic Inductance Detectors On Sapphire And Diamond Substrates For Fusion Plasma Polarimetric Diagnostics written by Mazzocchi, Francesco and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-07-01 with Technology & Engineering categories.
This work aimed at designing, studying and producing the first prototypes of KIDs tailored for fusion plasma polarimetric diagnostics. Diamond was considered for the first time as substrate material for low-temperature superconducting detectors given its unmatched optical, radiation hardness and thermal qualities, properties necessary for working environments potentially saturated with radiation. This work represents a first step toward the optimization and final application of this technology.
Numerische Modellierung Und Simulation Von Bleifreien Relaxor Ferroelektrikum Kompositen
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Author : Streich, Friedemann
language : de
Publisher: KIT Scientific Publishing
Release Date : 2023-03-24
Numerische Modellierung Und Simulation Von Bleifreien Relaxor Ferroelektrikum Kompositen written by Streich, Friedemann and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-03-24 with Technology & Engineering categories.
Das elektromechanische Verhalten zweier neu entwickelten, auf Natrium-Bismut-Titanat basierenden bleifreier Ferroelektrika sowie daraus bestehenden Zweilagenkompositen wird durch Experimente und numerische Simulationen untersucht. Für die Finite-Elemente-Methode wird hierzu ein dreidimensionales, vollständig elektromechanisch gekoppeltes Materialmodell entwickelt. An Hand einer Parameterstudie werden die elektromechanischen Kopplungseigenschaften der Zweilagenkomposite optimiert. - The electromechanical behavior of two new sodium bismuth titanate based lead-free ferroelectric materials as well as bilayer composites are investigated in experiments and numerical simulations. For the Finite-Element-Method, a fully coupled, three dimensional ferroelectric constitutive model is developed. In a parameter study, the electromechanical coupling of bilayer composite is optimized.
Everlasting Energy In Memoriam Prof Dr Ing Robert Stieglitz
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Author : Wetzel, Thomas
language : de
Publisher: KIT Scientific Publishing
Release Date : 2025-05-06
Everlasting Energy In Memoriam Prof Dr Ing Robert Stieglitz written by Wetzel, Thomas and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2025-05-06 with categories.
In this volume, colleagues and friends of Prof. Dr.-Ing. Robert Stieglitz, who died suddenly and unexpectedly on 6 December 2023, pay tribute to his life and his extraordinary achievements as an internationally recognised scientist. Prof. Stieglitz's profound view on fusion research, nuclear technology and renewable energy was appreciated worldwide. The contributions in this volume cover all these areas while reflecting his inspirational influence on the authors.
Impedanzbasierte Spannungspr Diktion Von Lithium Ionen Batterien
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Author : Hauck, Benjamin
language : de
Publisher: KIT Scientific Publishing
Release Date : 2024-07-03
Impedanzbasierte Spannungspr Diktion Von Lithium Ionen Batterien written by Hauck, Benjamin and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-07-03 with categories.
Diese Arbeit präsentiert ein physikalisch motiviertes Modell, welches die Zellspannung einer Lithium-Ionen-Batterie auf Basis der Zellimpedanz vorhersagt. Das Modell wurde an einer kommerziellen Pouchzelle parametriert und validiert. In einer umfassenden Simulationsstudie wird der Einfluss der Elektrodenmikrostruktur auf die Energie- und Leistungsdichte der Zelle quantifiziert. Darüber hinaus wird eine Routine zur Entwicklung anwendungsspezifischer Zelldesigns vorgestellt. - This work presents a physically motivated model that predicts the cell voltage of a lithium-ion-battery based on its impedance. The model was parameterized and validated on a commercial pouch cell. In a comprehensive simulation study, the influence of the electrode microstructure parameters on the energy and power density is quantified. Furthermore, a routine for the development of application-specific cell designs is developed.
Multiskalige Modellierung Von Lithium Ionen Batterien
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Author : Schmidt, Adrian
language : de
Publisher: KIT Scientific Publishing
Release Date : 2022-09-27
Multiskalige Modellierung Von Lithium Ionen Batterien written by Schmidt, Adrian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-27 with Technology & Engineering categories.
In dieser Arbeit werden Modellansätze für die internen Prozesse großformatiger Lithium-Ionen-Batterien entwickelt sowie experimentell parametriert und validiert. Damit werden sowohl die elektrochemischen Verluste in den Elektroden untersucht als auch deren Wechselwirkung mit der Potential- und Temperaturverteilung großformatiger Zellen. Darüber hinaus werden zulässige Betriebsbedingungen der Zellen identifiziert sowie Potentiale hinsichtlich der Leistungs- und Energiedichtesteigerung aufgezeigt. - In this work, model approaches for the internal processes of large-format lithium-ion batteries are developed, experimentally parameterized, and validated. The electrochemical losses in the electrode’s microstructure are investigated as well as their interaction with the heterogeneous potential and temperature distribution of large-format cells. In addition, permissible operating conditions of the cells are identified as well as potentials with regard to increasing power and energy density.